Trên cùng một nửa mặt phẳng bờ chứa tia $Ox$, vẽ hai tia $Oy, Ot$ sao cho $\widehat{xOy}=30^{o}$ và $\widehat{xOt}=60^{o}$.
a) Tia nào nằm giữa hai tia còn lại ? Vì sao ?
b) Tính $\widehat{yOt}$ ? Tia $Oy$ có là tia phân giác của $\widehat{xOt}$ không ? Vì sao ?
c) Gọi $Om$ là tia đối của tia $Oy$. Tính $\widehat{mOt}$ ?
d) Kể tên các cặp góc kề bù có trong hình vẽ.

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